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ML0308A Fiches technique(PDF) 4 Page - Minilogic Device Corporation Limited

No de pièce ML0308A
Description  Tiny Package, High Efficiency, White LED Driver and Step-up DC/DC Converter
Download  9 Pages
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Fabricant  MINILOGIC [Minilogic Device Corporation Limited]
Site Internet  http://www.minilogic.com.hk
Logo MINILOGIC - Minilogic Device Corporation Limited

ML0308A Fiches technique(HTML) 4 Page - Minilogic Device Corporation Limited

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ML0308 Preliminary
______________________________________________________________________________________________________
4/9
Rev. B, July 2005
BLOCK DIAGRAM – ML0308B
Figure 2: Internal Block Diagram of ML0308B
OPERATION
The ML0308 uses a pulse-skipping PFM, current
mode control scheme to provide excellent line and
load
regulation.
Its
operation
can
be
best
explained with reference to figure 2 and figure 1.
The oscillator generates a clock of 1.2MHz with
75% duty ratio for the PFM controller. When CE
pin goes HIGH, the power MOSFET switches at
1.2 MHz to charge the inductor and boost the
output voltage to the target level specified by R1
and R2. The output voltage is set as follow:
V
R
R
R
VOUT
23
.
1
2
2
1
×
+
=
(ML0308B)
When the inductor current reaches the current
limit, comparator A3 will toggle and the control
circuit will turn off the MOSFET immediately. So
the inductor current is limited. Therefore, soft-start
is achieved and potential hazards like current and
voltage overshoot are avoided. When output
voltage reaches and rises over the regulation point,
amplifier A2 will amplify the error. The chip will
adjust its pulse-skipping rate to monitor the output
voltage.


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